dns_scale_records.go

Documentation: k8s.io/kubernetes/test/e2e/network

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package network
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"strconv"
    23  	"time"
    24  
    25  	v1 "k8s.io/api/core/v1"
    26  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    27  	"k8s.io/apimachinery/pkg/util/wait"
    28  	"k8s.io/client-go/util/workqueue"
    29  	"k8s.io/kubernetes/test/e2e/feature"
    30  	"k8s.io/kubernetes/test/e2e/framework"
    31  	e2enode "k8s.io/kubernetes/test/e2e/framework/node"
    32  	"k8s.io/kubernetes/test/e2e/network/common"
    33  	testutils "k8s.io/kubernetes/test/utils"
    34  	admissionapi "k8s.io/pod-security-admission/api"
    35  
    36  	"github.com/onsi/ginkgo/v2"
    37  )
    38  
    39  const (
    40  	parallelCreateServiceWorkers = 1
    41  	maxServicesPerCluster        = 10000
    42  	maxServicesPerNamespace      = 5000
    43  	checkServicePercent          = 0.05
    44  )
    45  
    46  var _ = common.SIGDescribe(feature.PerformanceDNS, framework.WithSerial(), func() {
    47  	f := framework.NewDefaultFramework("performancedns")
    48  	f.NamespacePodSecurityLevel = admissionapi.LevelPrivileged
    49  
    50  	ginkgo.BeforeEach(func(ctx context.Context) {
    51  		framework.ExpectNoError(e2enode.WaitForAllNodesSchedulable(ctx, f.ClientSet, f.Timeouts.NodeSchedulable))
    52  		e2enode.WaitForTotalHealthy(ctx, f.ClientSet, time.Minute)
    53  
    54  		err := framework.CheckTestingNSDeletedExcept(ctx, f.ClientSet, f.Namespace.Name)
    55  		framework.ExpectNoError(err)
    56  	})
    57  
    58  	// answers dns for service - creates the maximum number of services, and then check dns record for one
    59  	ginkgo.It("Should answer DNS query for maximum number of services per cluster", func(ctx context.Context) {
    60  		// get integer ceiling of maxServicesPerCluster / maxServicesPerNamespace
    61  		numNs := (maxServicesPerCluster + maxServicesPerNamespace - 1) / maxServicesPerNamespace
    62  
    63  		var namespaces []string
    64  		for i := 0; i < numNs; i++ {
    65  			ns, _ := f.CreateNamespace(ctx, f.BaseName, nil)
    66  			namespaces = append(namespaces, ns.Name)
    67  			f.AddNamespacesToDelete(ns)
    68  		}
    69  
    70  		services := generateServicesInNamespaces(namespaces, maxServicesPerCluster)
    71  		createService := func(i int) {
    72  			defer ginkgo.GinkgoRecover()
    73  			framework.ExpectNoError(testutils.CreateServiceWithRetries(f.ClientSet, services[i].Namespace, services[i]))
    74  		}
    75  		framework.Logf("Creating %v test services", maxServicesPerCluster)
    76  		workqueue.ParallelizeUntil(ctx, parallelCreateServiceWorkers, len(services), createService)
    77  		dnsTest := dnsTestCommon{
    78  			f:  f,
    79  			c:  f.ClientSet,
    80  			ns: f.Namespace.Name,
    81  		}
    82  		dnsTest.createUtilPodLabel(ctx, "e2e-dns-scale-records")
    83  		ginkgo.DeferCleanup(dnsTest.deleteUtilPod)
    84  		framework.Logf("Querying %v%% of service records", checkServicePercent*100)
    85  		for i := 0; i < len(services); i++ {
    86  			if i%(1/checkServicePercent) != 0 {
    87  				continue
    88  			}
    89  			s := services[i]
    90  			svc, err := f.ClientSet.CoreV1().Services(s.Namespace).Get(ctx, s.Name, metav1.GetOptions{})
    91  			framework.ExpectNoError(err)
    92  			qname := fmt.Sprintf("%v.%v.svc.%v", s.Name, s.Namespace, framework.TestContext.ClusterDNSDomain)
    93  			framework.Logf("Querying %v expecting %v", qname, svc.Spec.ClusterIP)
    94  			dnsTest.checkDNSRecordFrom(
    95  				qname,
    96  				func(actual []string) bool {
    97  					return len(actual) == 1 && actual[0] == svc.Spec.ClusterIP
    98  				},
    99  				"cluster-dns",
   100  				wait.ForeverTestTimeout,
   101  			)
   102  		}
   103  	})
   104  })
   105  
   106  func generateServicesInNamespaces(namespaces []string, num int) []*v1.Service {
   107  	services := make([]*v1.Service, num)
   108  	for i := 0; i < num; i++ {
   109  		services[i] = &v1.Service{
   110  			ObjectMeta: metav1.ObjectMeta{
   111  				Name:      "svc-" + strconv.Itoa(i),
   112  				Namespace: namespaces[i%len(namespaces)],
   113  			},
   114  			Spec: v1.ServiceSpec{
   115  				Ports: []v1.ServicePort{{
   116  					Port: 80,
   117  				}},
   118  			},
   119  		}
   120  	}
   121  	return services
   122  }
   123
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